CN102536774B - Industrial circulating water pump group operation characteristic and operational energy efficiency analytical equipment - Google Patents
Industrial circulating water pump group operation characteristic and operational energy efficiency analytical equipment Download PDFInfo
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Abstract
The invention provides a kind of industrial circulating water pump group operation characteristic and operational energy efficiency analytical equipment, cannot carry out the problem that continues to monitor and analyze of operation characteristic and efficiency to solve existing industrial circulating water system for the operation of water pump. It comprises pump characteristics analysis pump characteristics server (computer), master data acquisition system (sensor, A/D converter), communication system (remote service) and auxiliary equipment (cable, data cable connector etc.), pump operating characteristic database, data interaction system and data-interface. On the basis of data access, independent operating completely. According to the situation of actual flow process, this device also can be used as in original monitoring system, the standalone feature module deriving. This method carry out the direct motion that both ensures technological process, make again water pump operation put the at utmost operating condition of closing to reality, be the method for the efficient operating mechanism of a kind of rapid build water pump.
Description
Technical field
The present invention relates to a kind of for analyzing industrial circulating water system water pump and pump group operation characteristic and fortune under changeable operating modeThe analytical equipment of row efficiency.
Background technology
Water pump, as the power set of flow process system transmission & distribution, must can ensure corresponding technological process, can be manyNormally operation under the working condition becoming. In existing flow process transmission & distribution managing and control system, the design of distributing system, all according to for many years oneThe unfavorable operating mode of meeting, taking the demand that ensures hydraulic characteristic least favorable user in same flow process as prerequisite, carries out. For making systemSafe direct motion, generally all possesses 10 ~ 20% design safety surplus when design. The requirement of design is proposed user on the other hand,Time, generally can, according to the feature of corresponding technological process, reserve suitable development space again. These two kinds of theories, all directly causeThe design margin of water pump and distributing system is larger, and this is also in flow process transmission & distribution process, to occur that of low load with strong power is important formerCause.
Along with the strict implement of national sustainable development state basic policy, how to make flow system can realize as required and supply with,Become the important step that determines Business survival and development. Therefore, given dynamical system, need to be according to flow process load intensity and ringThe variation of border operating mode, to the operation of water pump, controls efficiently. For given dynamical system, pump variable frequency and pump group are excellentChange team control, become the Baseline Control Strategy of corporate process optimization operation. This just directly causes water pump and pump group, needs to realize differentCoupling operation under operating mode. For enterprise and on-the-spot operation Fang Eryan, how intuitively to control objectively water pump under changeable operating modeOperation characteristic and operational energy efficiency, become major issue urgently to be resolved hurrily.
About the known parameters of water pump and the operation of pump group, be nothing but under declared working condition, the power frequency operation characteristic of water pump: water pumpLift is the variation with flow with the variation of flow, water pump efficiency, and pump shaft power is with the variation of flow. This variationCurve generally all adopts, the connection of the discrete data point based on the experiment of serial experiment chamber. And in actual moving process, it moves specialThe analysis of the variation of property and operational energy efficiency, even if under the power frequency and declared working condition condition for single pump, does not also often existThe model of intuitive analysis. More cannot mention whole pump group, at flow process load complicated and changeable, environmental working condition, and complicated groupClose under form the Real-Time Monitoring of operation characteristic and operational energy efficiency and continuously analysis.
In actual moving process, in order to ensure the safe direct motion of main process flow process, operation side generally adopts power frequency fortuneTurn and add outlet valve adjusting, the operation strategy of house steward's constant voltage. Once pump group puts into operation, generally no longer mate the excellent of operating modeChanging operation regulates. The management mode that this tradition is extensive, from the angle using, after causing optimization to carry out, water pump and pump groupOperation characteristic is difficult to the problem of analyzing. In other words, existing industrial circulating water system, does not carry out cannot for the operation of water pump yetCarry out continuing to monitor and analyzing of operation characteristic and efficiency.
Even if in pump variable frequency technology day by day under ripe overall situation, about operation characteristic and the operation of water pump after frequency conversionThe analysis of efficiency, also basis just often, frequency conversion similarity law rough, artificially simply sentencing based on discrete design characteristicFixed, and cannot carry out continuously, intuitively the Real-Time Monitoring to pump operating characteristic and operational energy efficiency at all and analyze continuously. ManyUnder variable working condition, in pump group, the parallel connection of different water pumps and frequency conversion parallel running, increased pump sets in parallel operation specificity analysis greatlyDifficulty. And for whole technological process, under changeable operating mode, to water pump and pump group operation characteristic, intuitively supervise objectively in real timeSurveying and analyze continuously, is the basic link that system operational management and operation are optimized, and is the operational management of minimizing system and optimizationTo the dependent fundamental way of artificial experience.
Summary of the invention
The object of this invention is to provide a kind of industrial circulating water pump group operation characteristic and operational energy efficiency analytical equipment, to solveExisting industrial circulating water system for the operation of water pump cannot carry out operation characteristic and efficiency continue to monitor and analyze askTopic.
Technical solution of the present invention is as follows:
The changing condition of water pump and pump group operation characteristic and operational energy efficiency, can open according to corresponding background data baseExhibition. Comprise pump characteristics analyze pump characteristics server (computer), master data acquisition system (sensor, A/D converter),Communication system (remote service) and auxiliary equipment (cable, data cable connector etc.), pump operating characteristic database, data interaction systemSystem and data-interface. On the basis of data access, independent operating completely. According to the situation of actual flow process, this device also canUsing as in original monitoring system, the standalone feature module deriving.
A kind of industrial circulating water pump group operation characteristic of the present invention and operational energy efficiency analytical equipment comprise pump characteristics model library(A) and water pump and pump group operational energy efficiency model library (B),
Described pump characteristics model library (A) comprises main frequency water pump operation characteristic model library (A1), pump variable frequency operation characteristicModel library (A2), the parallel connection of pump group and parallel connection frequency conversion characteristic model storehouse (A3), described water pump and pump group operational energy efficiency model library (B) bagDraw together pump group efficiency unit (B1), water pump unit operation efficiency model library (B2) and water pump pump group operational energy efficiency model library (B3),Under changeable operating mode, carry out monitoring and the analysis of operational energy efficiency variation; Process is as follows:
1. the input of water pump and pump group fundamental characteristics data
2. each sensor assembly reads the basic parameter of water pump operation
Set of sensors comprises flow sensor, valve position sensor, pressure sensor, water pump frequency sensor, motor electricityStream reading device, main flow monitoring sensor, environmental working condition sensor, pump characteristics server, flow sensor, valve position sensingDevice, pressure sensor, water pump frequency sensor, current of electric reading device, main flow monitoring sensor and environmental working condition sensingDevice is connected with pump characteristics server respectively.
3. model library is set up
In the present invention, the foundation of described main frequency water pump operation characteristic model library (A1), comprises lift and stream under power frequency conditionAmount display model, efficiency and shaft power are with the foundation of the explicit model of changes in flow rate; Under described power frequency condition, lift and flow are aobviousThe process of the foundation of representation model comprises: according to the parameter value of given water pump power frequency characteristic serial variance, described parameter comprisesLift and flow on corresponding operating point, then use numerical fitting technology by original discrete feature song based on least square methodLine carries out explicitly description by having enough high-precision interpolation polynomials.
Described main frequency water pump operation characteristic model library (A1) is set up, and comprises the real-time prison of step 1) list pump power frequency operation characteristicSurvey and analytic unit, based on the power frequency characterisitic parameter of specifying water pump to provide, based on least square method, independently build water pump power frequency fortuneThe demonstration continuous approximation model turning, makes user directly according to read flow, judge its corresponding lift, efficiency and shaft workThe value of rate, and utilize graphical interfaces technology, it is intuitively presented to the runnable interface that pump characteristics server (9) is corresponding in real timeUpper, by the variation of this interface Real-Time Monitoring running operating point.
In the present invention, the foundation of described pump variable frequency operation characteristic model library (A2) is according to frequency conversion correspondence theorem, with instituteState main frequency water pump operation characteristic model library (A1) for basis, determine lift, flow and shaft power under respective frequencies conditionValue, and then it is each self-corresponding to construct under different frequency condition lift and flow, efficiency and flow and shaft power and flowExplicit model.
Under different frequency condition, specify the similarity law of pump operating characteristic, within the scope of rational frequency conversion, directlyUnder given different operating frequency, the continuous analytical model of pump operating characteristic.
In the present invention, described changeable operating mode mutually under, pipe network actual operating mode put corresponding affinity operating points determine,The method according to Numerical Methed for Solving Non-linear Equations, taking constructed water pump (pump group) power frequency characteristic model as basis, in conjunction with similar workThe definition of condition point, constructs interval point of method of partly approaching of frequency conversion affinity operating points.
In the present invention, the foundation in the parallel connection of described pump group and parallel connection frequency conversion characteristic model storehouse (A3) is by corresponding single pump workFrequently pump operating characteristic model library (A1) and pump variable frequency operation characteristic model, according to the principle of stack, construct and specify water pump to existThe explicit model of lift and flow under various combination condition; Efficiency and shaft power are carried out the analysis of unit.
On the basis of separate unit water pump power frequency and frequency property analysis, generally all adopt the spy of parallel running according to pump groupLevy, according to the relation between water pump lift in parallel and flow, set up the Real Time Monitoring interface of water pump parallel connection and parallel connection frequency conversion,By the variation of the corresponding characterisitic parameter of pump group combined running mode, intuitively with the form of graphical interfaces and data form, remember in real timeRecord and demonstration.
The foundation of described water pump and pump group operational energy efficiency model library (B): for water pump and the pump group of specifying model, according to rightThe operational energy efficiency model of answering, builds operational energy efficiency data table items and table page, for different model water pump and corresponding combination thereof andFrequency conversion form, different table pages can form water pump and pump group operational energy efficiency model library, and the icon instrument in application model storehouse, can formThe graphical interfaces of corresponding states water pump and pump group operational energy efficiency, this interface form can adopt the mode of coordinate graphic, by corresponding workThe operational energy efficiency of condition point intuitively shows;
The establishment of described pump group efficiency unit (B1): whole water pump pump group is used as a complete efficiency unit, transportsThe establishment of row efficiency;
The foundation of described water pump unit operation efficiency model library (B2): motor, under different rotating speeds, is inputted from inputTotal electric energy, as the gross energy of this efficiency unit, the primary water geopotential energy sum of exit of pump sound pressure head and lifting, doFor effective output energy of system; Generally speaking,, for given pipe network system, elementary water level is a definite value substantially, flowChange the variation that directly causes initial water level potential energy;
The foundation of described water pump pump group operational energy efficiency model library (B3): whole water pump pump group is thought of as to an efficiency listUnit, carries out the analysis of operational energy efficiency.
In the foundation of described water pump unit operation efficiency model library (B2),
The present invention on the basis of the autonomous water pump of setting up and pump group operational energy efficiency analytical model, pump characteristics serverIn, application data base technology, sets up industrial circulating water water pump and pump group operational energy efficiency database, and by graphical interfaces, rightOn the basis of operational energy efficiency Real-Time Monitoring and record, carry out the continuous analysis of the operational energy efficiency of water circulating pump and pump group.
With water pump and pump group operation characteristic database, the run parameter collecting is basis, according to following model,In the operational energy efficiency database of pump characteristics server, carry out the analysis of operational energy efficiency.
Power factor (PF) under corresponding rotating speed is cos Φ, and power input to machine is
In formula,Under respective frequencies, the voltage and current of motor, these two parameters generally all have prison intuitivelySurvey data,It is power input to a machine;
The effective output of water pump is
In formula,For the density of cycle fluid,；For acceleration of gravity,；For the flow of measuring,；The required head of pipe network,；Pipe network feature hydrostatic head, water pump pressure head,；Exit of pump pipeline cross sectionIt is long-pending,；
The operational energy efficiency that defines water pump in running is
In the constructed analysis system about water pump operation efficiency, the power factor (PF) of different rotating speeds motor needs aboveDetermine with the relation of rotation speed change according to corresponding phase deviation, this also can be from given discrete data, the company of providingThe variation model of continuous approximate explicit power factor (PF), thus the operational energy efficiency of corresponding water pump can provide by explicitly.
Under changeable operating mode, single pump operation efficiency variation monitoring data, are recorded in real time at the phase of upper pump characteristics serverAnswer in list item, and explicit with the form of chart, the basis of analyzing continuously as water circulating pump operational energy efficiency.
Whole water pump pump group is thought of as to an efficiency unit, adopts house steward's operating pressure and flow as molecule, andThe shaft power that participates in operation water pump is superposeed and calculates the operational energy efficiency of whole pump group as denominator;
Motor is under different rotating speeds, and from total electric energy of input input, as the gross energy of this efficiency unit, water pump goes outThe primary water geopotential energy sum of mouth sound pressure head and lifting, as effective output energy of system; Generally speaking, for givenPipe network system, elementary water level is a definite value substantially, the variation of flow directly causes the variation of initial water level potential energy.
The introducing of this concept is that whole water pump pump group is thought of as to an efficiency unit, and does not distinguish electric efficiency, pump efficiencyRate and transmission efficiency are the direct embodiments of water pump overall operation efficiency.
Corresponding parameter all can provide by the method for collection or explicit model in pump characteristics server, and this makes waterPump operation efficiency can be in pump characteristics server, by dynamically Graphics Processing of upper objective interface. Designated cycle water systemThe related data of system pump group operational energy efficiency, real time record enters the corresponding list item of pump characteristics server pump group operational energy efficiency databaseIn, and with the form of chart, give intuitively explicit, the basis of analyzing continuously as pump group operational energy efficiency.
Water pump and pump group thus, under operating mode complicated and changeable and the changeable method of operation, operational energy efficiency can obtain in real timeMonitoring and record. And according to operational energy efficiency database, to the continuous analysis of being correlated with of the operational energy efficiency characteristic of water pump pump group.
Under the changeable operating mode and method of operation condition of the present invention's exploitation, water pump and pump group operation characteristic and operational energy efficiency monitoringAnalytical equipment, can pass through control system interface, with the form of chart, directly perceived, visual and provide in real time, water pump and pump group fortuneRow characteristic and operational energy efficiency parameter, the Line Continuity analysis of going forward side by side.
1) Real-Time Monitoring and the analysis of single pump power frequency operation characteristic
Based on specifying the power frequency characterisitic parameter that provides of water pump, based on least square method, independently build water pump power frequency runningShow continuous approximation model, make the user can be directly according to read flow, judge its corresponding lift, efficiency and shaft powerValue, and utilize graphical interfaces technology, it is intuitively presented on the runnable interface that pump characteristics server (9) is corresponding in real time,By the variation of this interface Real-Time Monitoring running operating point.
Corresponding approximate power frequency characteristic model exists with following form, can directly give water outlet by the variation of flowThe value of pump operation characterisitic parameter.
The benefit of this model and method is to make under power frequency condition, the change of the pump operating characteristic that changes in flow rate causesChange and monitored at a glance, it is recorded in corresponding database items, and is shown by graphical interfaces seriallyReach, realized the visual control of water pump power frequency operation characteristic.
As a further improvement on the present invention, during described main frequency water pump operation characteristic model library (A1) is set up, corresponding is nearExist with following form like power frequency characteristic model, can directly provide pump operating characteristic parameter by the variation of flowValue;
Wherein Q, H, η and N are respectively flow, lift, efficiency and the shaft power of water pump,By being builtCorresponding numerical value undetermined coefficient in vertical each model.
As a further improvement on the present invention, during described pump variable frequency operation characteristic model library (A2) is set up, frequency propertyAnalysis, general according to the similarity relation of frequency conversion, taking power frequency operation characteristic as basis and launch according to following relational expression:
Wherein: N represents the shaft power of water pump, kW, subscript e and s be corresponding expression under operating condition and design conditions respectivelyParameter; N represents the rotating speed of water pump under different frequency.
First kind of way, is to be directly the ratio of rotating speed by respective frequencies, according to above-mentioned relation, based on showing of power frequency characteristicIn formula approximate model, analyze under frequency conversion condition the operation characteristic parameter of single pump frequency conversion. Make it be recorded in corresponding database itemsIn, and expressed by graphical interfaces serially, realize the visual control of pump operating characteristic.
Second method is the discrete operating point based on declared working condition, and applies above-mentioned relation, finds out after frequency conversion correspondingRunning operating point, then adopt main frequency water pump operation characteristic model library (A1) set up in same steps, set up corresponding frequency conversionContinuous moving model under condition, and then according to this model, application graph technology, provides under suitable parameter interval, operation ginsengThe coordinate diagram that number changes, from figure, backward read goes out other corresponding operation characteristic parameter, go forward side by side line item and analysis.
From main frequency water pump operation characteristic model library (A1) of setting up, calculate first respectively, divide with power frequency characteristicIn analysing, each given discrete operating point, the value of lift, flow and shaft power under corresponding frequency condition, then presses successivelyAccording to identical way in setting up with main frequency water pump operation characteristic model library (A1), construct under all frequency conditions liftWith flow, efficiency and flow and shaft power and the each self-corresponding explicit model of flow, record and analysis water pump are at different frequencyUnder operation characteristic.
4. the Real-Time Monitoring of pump sets in parallel operation characteristic, record and analysis
Complicated technology flow process, under different operating modes, water pump need to carry out the double optimization of team control and frequency conversion, could real meaningThe supply as required of upper realization flow, multi-form water pump combined running scheme, the variation of respective pump group characteristic will be answered very muchAssorted. When traditional pump characteristics monitoring system cannot be analyzed these complicated variations continuously, the operation characteristic of water pump, more cannot mentionThe Continuous Tracking of its variation and monitoring. This is also the basic place that the present invention is different from traditional pump characteristics monitoring system.
On the basis of separate unit water pump power frequency and frequency property analysis, generally all adopt the feature of parallel running according to pump group(analysis, series connection is without essential distinction, just different from characteristic in parallel), according to the pass between water pump lift in parallel and flowSystem, sets up the Real Time Monitoring interface of water pump parallel connection and parallel connection frequency conversion, by the corresponding characterisitic parameter of pump group combined running modeChange, intuitively with the form of graphical interfaces and data form, record and show in real time.
The actual moving process of parallel running, all meet corresponding Egress node pressure head identical, and the stack of pump capacity is formerReason, on the basis of above-mentioned single pump and single pump frequency conversion model, applies this parallel connection rule, is easy to read under corresponding discharge condition,Operational factor corresponding to different parallel waies, go forward side by side line item and demonstration. Also can be under this rule condition, based on serial variance pointAnd least square method, build the characteristic equation group of any operational mode.
According to above-mentioned every analysis, staff of the same trade, can build under operating mode complicated and changeable easily, and industry followsRing water water pump and pump group analysis on Operating system.
Brief description of the drawings
Fig. 1 is that in the present invention, sensor connects schematic diagram;
Fig. 2 is single pump frequency conversion and power frequency characteristic model curve map in parallel;
Fig. 3 is the single pump characteristic model curve map in parallel in the time of 90% frequency in Fig. 2;
Fig. 4 is the single pump characteristic model curve map in parallel in the time being 80% frequency in Fig. 2;
Fig. 5 is the single pump characteristic model curve map in parallel in the time being 70% frequency in Fig. 2;
Fig. 6 is that in the present invention, interval halving is determined frequency conversion affinity operating points algorithm flow chart;
Fig. 7 is model library composition schematic diagram of the present invention.
Detailed description of the invention
The changing condition of water pump and pump group operation characteristic and operational energy efficiency, can open according to corresponding background data baseExhibition. Comprise pump characteristics analyze pump characteristics server (computer), master data acquisition system (sensor, A/D converter),Communication system (remote service) and auxiliary equipment (cable, data cable connector etc.), pump operating characteristic database, data interaction systemSystem and data-interface. On the basis of data access, independent operating completely. According to the situation of actual flow process, this device also canUsing as in original monitoring system, the standalone feature module deriving.
As shown in Figure 1, model library composition of the present invention comprises pump characteristics model library (A) and water pump and pump group operational energy efficiency mouldType storehouse (B), described pump characteristics model library (A) comprises main frequency water pump operation characteristic model library (A1), pump variable frequency operation characteristicModel library (A2), the parallel connection of pump group and parallel connection frequency conversion characteristic model storehouse (A3), described water pump and pump group operational energy efficiency model library (B) bagDraw together pump group efficiency unit (B1), water pump unit operation efficiency model library (B2) and water pump pump group operational energy efficiency model library (B3),Under changeable operating mode, carry out monitoring and the analysis of operational energy efficiency variation.
In the function of apparatus of the present invention and actual motion, implementation is as follows:
1. the input of water pump and pump group fundamental characteristics data
For given industrial circulating water distributing system, generally all can provide under declared working condition water pump and pump group basicOperation characteristic data, according to corresponding list item, are recorded in the corresponding water pump of database of pump characteristics server 9 by these dataAnd in pump group fundamental characteristics parameter list item, be convenient to read and reference.
Meanwhile, the basic control mode setting for idiographic flow pump group, sets up corresponding specificity analysis list item, prepares againstWhen concrete operating analysis, adopt. The basic control mode of pump group mainly refers in water pump pump cohort control techniques, water pump operation number of unitsThe basic model of selecting. Different integrated modes, has determined the basic parameter excursion of pump group and single pump operation, so moveSchema entry, is actual concrete analysis, need to select.
2. each sensor assembly reads the basic parameter of water pump operation
As shown in Figure 7, sensor comprises flow sensor 1, valve position sensor 2, pressure sensor 3, water pump frequency sensingDevice 4, current of electric reading device 5, main flow monitoring sensor 6, environmental working condition sensor 7, pump characteristics server 9, flowSensor 1, valve position sensor 2, pressure sensor 3, water pump frequency sensor 4, current of electric reading device 5, main flow monitoringSensor 6 is connected with pump characteristics server 9 respectively with environmental working condition sensor 7.
In actual moving process, by being contained in the sensor of water pump relevant position, read the basic parameter of water pump operation.
1) reading and record of pump capacity
By being contained in the flow sensor 1 of exit of pump position, read operating condition, the value of pump capacity. For greatlyMost technological processes, flow is that the measurement index of whole transmission & distribution flow process (certainly, also has part flow process, more focuses on liftRequire). Also be for given water pump, determine the fundamental quantity of its running operating point. If analog signal values needs by rightThe A/D converter 8 of answering, analog signal passes to pump characteristics server 9 with digital form. And will be recorded in performance dataIn storehouse, in corresponding list item.
2) reading and record of water pump terminal valve valve position
For the water pump of specifying, generally need to be by carrying out the adjusting of outlet valve (part is imported valve), to coordinateThe water pump of power frequency and frequency conversion running, makes its output parameter reach terminal use's demand. Analyze from another angle, import and exportThe adjusting of valve, will directly change the operating condition of water pump. Set it as one of adjusting factor of water pump variable parameter operation, water pumpImport and export valve position signal, also read in pump characteristics server 9 by corresponding valve position sensor 2 and circuit, and will be recorded in spyProperty database in, in corresponding list item.
3) reading and record of water pump front and back pressure and pressure reduction
In the distributing system of specifying, for water pump, the operational factor that Section 2 can intuitively be measured, for water pumpPressure head item. Need to measure unit fixed on water pump suction pressure, outlet pressure and front and back pressure reduction, these data are passed through the pressure sensor 3 of setting,Coordinate servicing unit, read in pump characteristics server 9, and will be recorded in property database, in corresponding list item.
4) reading and record of pump operation frequency
If water pump has adopted converting operation optimisation strategy, corresponding different loads and environmental working condition, the parameter of regulation and control is firstIt is exactly the operating frequency of motor. Meanwhile, the frequency of motor is also one of fundamental calculating power input to machine. So needBy the water pump frequency sensor 4 of setting, by the frequency of pump operation, coordinate servicing unit, read in pump characteristics server 9,And will be recorded in property database, in corresponding list item.
5) reading and record of pump operation electric current
Under different operating mode respective frequencies conditions, the absolute reference index of pump energy consumption, by the electric current that is motor, soIn order to control under different operating modes, the operational factor of water pump, must, to the electric current of corresponding pump motor, carry out Real-Time Monitoring. ThisFunction, by the current of electric reading device 5 of setting, coordinates servicing unit, reads in pump characteristics server 9, and will be recorded in spyProperty database in, in corresponding list item.
6) what flow process load intensity changed reads and record
Analyze the variation of the load intensity that the major embodiment of changeable operating mode is flow process, and environmental working condition from subjective angleMust change. In order to analyze under different operating modes, the variation of the continuous operation characteristic of water pump, need to be to the change of changeable operating mode itself,Carry out record. For given technological process, the variation of its load intensity information, is subject to the impact of the market factor, changesHave certain randomness, for the technique of long-term running, its variation has again certain cyclophysis. In actual variationCheng Zhong, the variation of flow process load intensity, is embodied as the variation of main process operational factor, directly the operation of water pump is causedImpact, need to, by the variation of its parameter, based on existing main flow monitoring sensor 6, coordinate servicing unit, reads in pump characteristics clothesBusiness device 9, and will be recorded in property database, in corresponding list item.
7) what environmental working condition changed reads and record
For water pump, environmental working condition is the variation of environment temperature and humidity especially, has quite for water pump operationThe impact of degree, is also to cause one of factor that operating mode is changeable as above-mentioned, in order to analyze under different operating modes, and the continuous operation of water pumpThe variation of characteristic, need to, to the change of environmental working condition itself, carry out record. The environmental working condition sensor 7 of setting based on scene, joinsClose servicing unit, read in pump characteristics server 9, and will be recorded in property database, in corresponding list item.
Reading of above-mentioned parameters, can adopt the sensor of new interpolation, also can be according to actual conditions, for reducing waveTake, adopt the sensor of existing monitoring system. Corresponding data is continuously and reads in, and can pass through corresponding interface, aobvious dynamicallyBe shown in chart, with user friendly directly monitoring. Also can pass through historical record, the corresponding flow process specified characteristic ginseng of Direct AnalysisThe variation of number, carries out relevant specificity analysis.
Embodiment: the basic process that pump characteristics model library and pump operating characteristic model library are set up is as follows:
A1. pump characteristics model library is set up;
Step 1: the foundation of main frequency water pump operation characteristic model library (A1);
The foundation of power frequency operation specificity analysis model and corresponding list item is under changeable working condition, water pump unit operation andThe basis of water pump group analysis on Operating. In information system, the foundation of pump operating characteristic model library, is to be based upon water pump operationOn the basis of characteristic model. So first need to set up the explicit model of water pump power frequency analysis on Operating. Actual motion mistakeCheng Zhong, the analysis of pump operating characteristic, is by some known parameter, according to set up model, directly explicit providingCorresponding other characterisitic parameter, and recording occurring continuously and dynamically demonstration, this is the function that original water pump monitoring system does not possess.
1. the foundation of lift and flow indication model under power frequency condition
First according to the parameter of given water pump power frequency characteristic serial variance---lift on corresponding operating point, flowValue, uses numerical fitting technology that original discrete feature curve negotiating is had to enough high-precision inserting based on least square methodValue multinomial carries out explicitly description, and polynomial exponent number is chosen as three times, by cubic interpolation polynomial sufficiently highThe dominant characteristic that provides serial system under precision, with the example that is changed to of flow and lift, has the approximate mould of cubic interpolation polynomialType formula is as formula (1):
（1）
Wherein: H is pump head, m;
Q is volume flow, m3/s；
A, b, c, d are while adopting least square method matching, the undetermined coefficient of corresponding approximate multinomial fitting formula. Single like thisThe operation characteristic of platform water pump just can obtain the real-time monitoring of Explicit Form. The foundation of water pump power frequency service performance model can makeUser is in continuous running, and one after measured after flow, just can be directly determines water pump this operating mode from above-mentioned modelLift.
Discrete operating point in characteristic model, general manufacturing firm can provide, as shown in the discrete operating mode of Fig. 2 unit power frequency.While having provided the running of certain type water pump unit power frequency in Fig. 2, the curve that lift-discharge characteristic model is corresponding, and Liang Tai and threeWhen homotype parallel connection pump, the curve of corresponding explicit model, as can be seen from the figure, model of fit curve, has very highPrecision, combination portray water pump operation characteristic.
2. efficiency is with the foundation of the explicit model of changes in flow rate;
Adopt the same steps of setting up with lift discharge relation model, according to the value of the discrete operating mode of correspondence, also can be straightSight provides under power frequency operating condition, and the approximation polynomial model that pump efficiency changes with pump capacity is right thereby intuitive analysis goes outAnswer under flow and lift condition, the efficiency of water pump is as formula (2);
（2）
In formula:While running for power frequency, under corresponding flow condition, the operational efficiency of water pump;It is the undetermined coefficient of corresponding explicit model. For this model, can intuitively show under different flow condition, water pump efficiencyChange.
3. pump shaft power is with the foundation of the explicit model of changes in flow rate;
Adopt the same steps of setting up with lift discharge relation model, according to the value of the discrete operating mode of correspondence, also can be straightSight provides under power frequency operating condition, the approximation polynomial model that pump shaft power changes with pump capacity, thus intuitive analysis goes outUnder corresponding flow and lift condition, the shaft power of water pump is as formula (3).
（3）
In formula:While running for power frequency, under corresponding flow condition, the operation shaft power of water pump;It is the undetermined coefficient of corresponding explicit model. For this model, can intuitively show different flow barUnder part, the variation of water pump operation shaft power.
In said process, in list item corresponding to that mode input model library, can be according in actual moving process,The variation of flow and lift, intuitively provides other operational factor of water pump, and with the form of chart, in real time and obtain continuously pointAnalyse.
Step 2: the foundation of pump variable frequency operation characteristic model library (A2);
Along with the development of converter technique, adopt the mode of energy-saving and frequency-variable to move, become the root of water pump actual motionThis selection. And change of frequency must cause the servo-actuated of pump operating characteristic, the analysis of this characteristic variations and demonstration, for wholeThe control of individual recirculated water flow process characteristic, its meaning is very obvious. So, the pump operating characteristic model library that the present invention proposesIn concept, under different frequency condition, pump operating characteristic is the important list item data of model library. Phase analyze be also based upon explicitOn the basis of model.
In actual moving process, the analysis of frequency property, general according to the similarity relation of frequency conversion, taking power frequency operation characteristic asAlso launch according to following relational expression (4) on basis:
（4）
Wherein: N represents the shaft power of water pump, kW, subscript e and s be corresponding expression under operating condition and design conditions respectivelyParameter; N represents the rotating speed of water pump under different frequency.
1. pump variable frequency specificity analysis
According to above-mentioned frequency conversion correspondence theorem, the water pump power frequency characteristic model of setting up from the first step, according to relational expression(4), calculate first respectively, in power frequency specificity analysis, each given discrete operating point, raising under corresponding frequency conditionThe value of journey, flow and shaft power.
Then successively according to step 1 in, identical way, constructs under all frequency conditions, lift and flow,The each self-corresponding explicit model of efficiency and flow and shaft power and flow, thus the water pump of objectively analyzing directly perceived is at different frequencyUnder operation characteristic. With the difference of explicit model process of establishing in step 1, after being just that motor rotation frequency changes,The variation that corresponding discrete data point produces according to relational expression (4) corresponding relation.
In actual analysis process, on the basis of above-mentioned model, can carry out suitable simplification, as provided frequency(rotating speed), while variation according to certain fixing rule, the coordinate diagram of corresponding model, application graph processing capacity, makes the user can be fastSpeed estimates under corresponding operating mode, the operation characteristic of water pump.
The discrete operating point of frequency conversion and model of fit curve, and Liang Tai and three parallel-connected pumps frequency properties, respectively at Fig. 2In Fig. 4, provide intuitively and shown.
As example, within the scope of rational frequency conversion, the complicated converting operation characteristic of the water pump under optional frequency and pump group,All can high accuracy intuitively provide objectively.
2. the determining of water pump affinity operating points flow when pipe network damping change
In actual moving process, due to the change of main flow load intensity and environmental working condition, user institute water requirement must be sent outChanging, thus for given pipe network system, it all can change along journey and local resistance, Circulating Pump System pairAnswer the waterpower state of pipe network system to change, thereby the required pressure head of given pipe network must change. In rational scope,For recirculated water flow process is efficiently moved, frequency conversion is first-selected method.
This situation is lift and the flow of known pipe network often, need to determine the affinity operating points that frequency conversion is corresponding.
Frequency conversion is with similarity relation formula (4), on the water pump power frequency running explicit model basis to set up, need to determine withPipe network actual condition is put corresponding affinity operating points, and this operating point must meet two condition one, must be at set up waterOn pump power frequency flow-lift model curve, must meet formula (1); Its two, must and pipe network operating point between exist similarRelational expression (4), what the present invention was affinity operating points determines, has set up interval point of method of partly approaching.
First by given pipe network operating point information, required lift and flow, build desirable pipe network curve, and mode is shown in passBe formula (5):
（5）
Wherein K is desirable pipe network damped coefficient, and relational expression (5) has been guaranteed the establishment of frequency conversion similitude, and this curve and institute buildThe intersection point of vertical main frequency water pump flow-lift model curve, is by frequency conversion and realizes affinity operating points corresponding to pipe network operating mode.
Affinity operating points is the intersection point of two nonlinear curves, for can be in analytic process, programmes and determines that this is similarPoint, the present invention has designed interval point half approximatioss, first builds nonlinear equation (6)
（6）
Certainly, in real process, its variation is carried out for parallel pumps, and corresponding water pump model is pump group mouldType, also can directly disassemble determining into single pump affinity operating points. Rationally determining under the condition of initial value, according to patrolling in Fig. 6Collect block diagram flow process, determine the value of pump capacity under corresponding lift, this is during traditional pump characteristics is analyzed, not available meritEnergy. In Fig. 6, the convergence principle of interval bisection algorithm is, in the trial calculating process of adjacent twice flow, corresponding twice flowThe difference of value, should be lower than thinking certain precision value of setting（For certain little arithmetic number that is greater than zero).
In corresponding diagram 6, determine that the basic process of frequency conversion affinity operating points flow process is as follows:
Before definite development, determine that known data comprise, the water pump power frequency operation characteristic model curve of setting up, realityRunning operating point and from actual operating mode point, the pipe network idealized characteristic obtaining, the amount of determining adjusts the intersection point of curve,Corresponding is the rooting process of nonlinear equation (6).
As shown in block diagram, first, in rational scope of initial values, read in a selected data on flows of attempting，
WillValue be brought in nonlinear equation (6), judgeValue, if this value is in certain precisionIn scope, leveling off to zero, represent got trial flow value, is the characteristic point of wanting to look for, and exports its value, otherwise carries out nextStep;
Adopt second trial flow settingUnder condition,Value, if had, represent the similitude that will inquire about, do not existOn interval, need to resetGetValue and interval scope, otherwise similitude is in intervalOn;
Putting before this order, replace originalValue, between this stylish interrogation zone, size isUpper one attempts the half of interval size, interval point half;
Again judgeSymbol, if this value is less than zero, interval further contracting half, otherwise order, carry out the operation of interval point half;
So continue to attempt interval point half inquiry, until, till setting convergence precision, finally orderThe flow of institute's wish inquiry similitude is, inquiry stops, the flow information of output similitude.
The distortion of the method also comprises the method for looking for one's roots according to the nonlinear equation of other type, determines that water circulating pump is realBorder operating condition.
For the analysis of the water pump power frequency operation characteristic according to exit of pump valve regulation and control, all can adopt above-mentioned two basicStep, carry out the specificity analysis of water pump unit power frequency operation.
Step 3: the foundation in the parallel connection of pump group and parallel connection frequency conversion characteristic model storehouse (A3);
Identical with abovementioned steps 1 and step 2, this list item is to be also based upon on corresponding explicit model basis. Actual fortuneIn row process, corresponding different kinds of process flow, the operation of water pump generally all adopts many water pump parallel connections, pump cohort control operation sideMethod. The complexity of this method is to have different combinations, as a frequency conversion multiplex (MUX) frequency, many frequency conversions simultaneously, not evenWater pump parallel connection and the frequency conversion parallel connection etc. of same model. Under different conditions in parallel, pump operating characteristic differs greatly, and intuitively gives objectivelyGo out under various combination mode, the model of pump group analysis on Operating, also has very important significance.
The water pump characteristic embodying in parallel is, corresponding pipe network Nodes, and pressure (lift) value that water pump provides is identical,And flow adopts the method for stack.
The operation characteristic of water pump various combination mode, is under the principle of this stack, according in step 1 and step 2,The water pump unit power frequency of setting up and converting operation model, carry out deployment analysis item by item, sets up respectively under condition in parallel, and pump group is raisedJourney, efficiency and shaft power, with the display model of changes in flow rate.
The foundation of corresponding model, adopts with the identical algorithm of step 1 and carries out, and can intuitively construct appointment water pump,The explicit model of lift and flow under various combination condition. Being corresponding discrete point, is the operating point by unit operation, according toCorresponding node pressure head is identical, and flow superposes and the discrete point that forms mutually. This has all obtained intuitively demonstration at Fig. 2 in Fig. 5.
For the technological process of specifying, the combined running strategy of its water pump pump group, the form of variation is just very limited, onlyThe variation that is data is comparatively numerous and diverse, can adopt above-mentioned 3 steps, builds its corresponding analysis on Operating model, and adopts existingFor model library technology, produce corresponding list item and figure, to launch intuitive analysis.
Step 4: the foundation of pump operating characteristic model library;
For quick and precisely carrying out of water pump operation analysis, obviously can set up for all types water pump, thereby thisThe bright concept that has proposed to set up pump operating characteristic model library.
This is the novel concept that the present invention proposes, and can, by the explicit model of dissimilar pump operating characteristic, rely onModern model storehouse technology, builds up the pump operating characteristic model library with different table pages, the technological process providing according to userFigure, directly selects and deployment analysis.
Fig. 2 shows single pump frequency conversion and power frequency characteristic model curve map in parallel, Fig. 3 be single pump in Fig. 2 90% frequentlyCharacteristic model curve map in parallel when rate; Fig. 4 is the single pump characteristic model curve map in parallel in the time being 80% frequency in Fig. 2; Fig. 5For the characteristic model curve map in parallel in the time being 70% frequency of the single pump in Fig. 2; Provide the power frequency of the flow lift of certain type water pumpThe part Explicit Analysis result of characteristic, unit frequency property, power frequency characteristic in parallel, frequency conversion characteristic in parallel, the curve in figure, allTo there is curve corresponding to explicit polynomial model. Other characteristic, as power with flow, efficiency the variation characteristic with flow,Also can, by above-mentioned mode, construct corresponding explicit model, facilitate the user of each side according to the actual requirements, carry out dynamic analysis waterThe characteristic of pump operation itself.
For the analysis of same type pump operating characteristic, can form different data table items, data page and data volume, andDissimilar water pump has separately binds into book form. For the parallel combination of different water pumps, be nothing but according to rule in parallel and above-mentioned each stepSuddenly, carry out one by one and with.
Under corresponding operational mode, user can be according to the Model of pump of oneself, pump stack features and operation characteristic (as severalPlatform parallel connection, frequency value) can obtain fast the value of needed water pump operation parameter, and can be at graph of a correspondence interfaceUpper, obtain dynamic demonstration directly perceived, and can adopt modern technology of Internet of things, carry out the teletransmission of data.
The construction of whole model library, is by all explicitly designs of the analysis of all types water pump, then passes through modern modelStorehouse technology, completes the analytic record to dissimilar pump characteristics, stores with corresponding table page form. When operation, useCorresponding interactive interface can be passed through in family, and user is appropriately selected according to the demand of oneself, objectively directly perceived in real time, with discreteThe modes such as data, continuous chart, monitor the operation characteristic of corresponding water pump and pump group. This point, has directly changed traditional monitoringPattern, cannot intuitively objective analysis different running method and operating mode under, the situation of water pump and pump group operation characteristic, and be follow-upWater pump operation is optimized, the data basis of having established basic aspect.
The foundation of water pump and pump group operational energy efficiency model library under B, changeable operating mode;
How is the operational energy efficiency of water pump judged? water pump operation itself is to be propulsive fluid by rotating machinery by electric energy conversionThe energy of work, the monitoring of its operational energy efficiency is to judge under actual working condition, to have how many electric energy to be effectively converted intoWith the demonstration directly perceived of energy, there is vital effect for the analysis of water pump operation state under changeable operating mode. For water pump andSpeech, the operational efficiency of its traditional sense needs the efficiency of tracking motor own and the efficiency of pump and the comprehensive ginseng of transmission efficiency therebetweenNumber, but these basic compositing factors are analyzed intuitively knot because the polytropy of operating mode often cannot provide in real processReally. This that is to say, even if made the basic operation characteristic of water pump clear by explicit characteristic model, but still cannot provide correspondenceThe intuitive analysis of water pump operation efficiency under operating mode.
Step 5: the integration of pump group efficiency unit;
The analytical method that the present invention breaks traditions, proposes by studied corresponding technological process whole water pump pump group (electricityMachine and the pump housing) be used as a complete efficiency unit, carry out the analysis of operational energy efficiency. Certainly,, for any one single pump, also canCarry out single pump operation Energy Efficiency Analysis intuitively.
Step 6: the foundation of water pump unit operation efficiency model library (B2);
Motor is under different rotating speeds, and from total electric energy of input input, as the gross energy of this efficiency unit, water pump goes outThe primary water geopotential energy sum of mouth sound pressure head and lifting, as effective output energy of system. Generally speaking, for givenPipe network system, elementary water level is a definite value substantially, the variation of flow directly causes the variation of initial water level potential energy.
Power factor (PF) under corresponding rotating speed is cos Φ, and power input to machine is
(7)
In formula,Under respective frequencies, the voltage and current of motor, these two parameters generally all have prison intuitivelySurvey data.It is power input to a machine.
The effective output of water pump is
（8）
In formula,For the density of cycle fluid,；For acceleration of gravity,；For the flow of measuring,；The required head of pipe network,；Pipe network feature hydrostatic head, water pump pressure head,；Exit of pump pipeline cross sectionIt is long-pending,；
The operational energy efficiency that defines water pump in running is
(9)
In the constructed analysis system about water pump operation efficiency, the power factor (PF) of different rotating speeds motor needs aboveDetermine with the relation of rotation speed change according to corresponding phase deviation, this also can be from given discrete data, the company of providingThe variation model of continuous approximate explicit power factor (PF), thus the operational energy efficiency of corresponding water pump can provide by explicitly.
The key character of this model is, under changeable operating mode, and monitoring and analysis that single pump operation efficiency changes
Step 7: the foundation of water pump pump group operational energy efficiency model library (B3)
Adopt house steward's operating pressure and flow as molecule, and using the shaft power that participates in operation water pump superpose asDenominator calculates the operational energy efficiency of whole pump group.
(10)
The introducing of this concept is that whole water pump pump group is thought of as to an efficiency unit, and does not distinguish electric efficiency, pump efficiencyRate and transmission efficiency are the direct embodiments of water pump overall operation efficiency.
Corresponding parameter all directly can be surveyed or can directly provide, and this becomes the demonstration directly perceived of water pump operation efficiency canEnergy. Under same frequency condition, the variation of water pump operation efficiency, can be used as the organic of water pump operation condition diagnosing and evaluationComposition.
Step 8: the foundation of water pump and pump group operational energy efficiency model library
For water pump and the pump group of specifying model, according to corresponding operational energy efficiency model, build operational energy efficiency data table itemsWith table page, for different model water pump and corresponding combination and frequency conversion form thereof, different table pages can form water pump and pump group fortuneRow efficiency model library, the icon instrument in application model storehouse, can form the graphical interfaces of corresponding states water pump and pump group operational energy efficiency,This interface form can adopt the mode of coordinate graphic, and the operational energy efficiency of corresponding operating point is intuitively shown.
C, water pump and the operation of pump group and the application of operational energy efficiency specificity analysis
Step 9: water pump operation efficiency diagnosis
Coordinate the value of corresponding operation characteristic parameter, can be jointly for judging whether water pump needs maintenance. If correspondingCharacterisitic parameter and operational energy efficiency all continue the value of analyzing lower than above-mentioned theory under the corresponding operating mode, and present and continue to depart fromWhen trend, water pump self need to be maintained, and concrete threshold value needs to determine according to the type of water pump. Above-mentioned two analysesDirectly perceived, the objective demonstration of data, provides strong data supporting for user controls water pump operation state.
D, water pump based on the water pump operation Energy Efficiency Analysis operating mechanism that efficiently resets;
In actual moving process, due to the polytropy of corresponding technological process load intensity and environmental working condition, in order to improve waterThe operational efficiency of pump, a lot of water pump operation Optimization Technologies have adopted the team control technology of water pump pump group, according to flow process load intensity andThe change of environmental working condition, carries out the control of water pump operation number of units and frequency. But owing to lacking pump operating characteristic and energyThe control directly perceived that effect is analyzed, this adjusting often all has strong dependence to artificial experience. How to make water pump changeableUnder operating mode, select fast efficient operational factor (frequency, number of units, flow, lift), operation, obviously has extremely important efficientlyMeaning. On the basis of pump operating characteristic and operational energy efficiency historical analysis data, for the efficient reset operation of system is opened upA brand-new road.
Step 10: the selection of the datum mark that efficiently resets;
For different technological processes, flow process load intensity and environmental working condition, be to send out according to market and regional featureChanging. Generally speaking,, although this change procedure can not completely periodically repeat, also there is certain quasi-periodicity spyProperty, this is when running in water pump operation strategy quasi-periodicity, the Rapid reset of parameters of pump has been established certain basis;
In tradition regulation and control, artificial experience is presented as on this basis, and under what load intensity and environmental working condition, unlatching is manyFew platform water pump, and move under which kind of frequency, artificial experience places one's entire reliance upon. Different experiences, shows water pump efficiencyDifference, cause system effectiveness and energy consumption difference huge;
And the pump operating characteristic model library that the present invention sets up and operational energy efficiency model library, can be by water pump operation correspondenceVarious conditional parameters be recorded in model library;
When actual motion, according to the historical data of water pump operation and present demand, taking load intensity and environmental working condition asReference, adopts data sorting technology, chooses the datum mark of four resets, makes the operating point of operation now, in selected fourIn the interval of reset datum mark, and read corresponding datum mark, the method for operation of water pump and corresponding characterisitic parameter.
Step 11: pump operation actual condition point determine;
Generally speaking, actual operating mode point is difficult to overlap completely with historical operating mode, so after datum mark is selected,Need to, according to set up specificity analysis model and operational energy efficiency model, will intend under running frequency the operational factor of water pump;
In four operation datum marks, in running operating point upper right side, (flow and lift are all greater than desirable value) benchmark is fixedFor basis, the operational factor that adopts this operating point is benchmark, the determining of this benchmark, and object is ensureing flow process safe direct motionOn basis, determine fast the initial value of the corresponding water pump operation condition of actual condition, this value under the base condition of setting, waterPump operation operating mode, quite approaching with required operating point.
When operating condition changes, make the initial launch frequency while adjustment that is optimized of water pump, from benchmark operating pointCorresponding frequency starts, and according to certain change of frequency amplitude, first progressively reduces the frequency of water pump, simultaneously according to set up waterPump (pump group) operation special type model, the variation of Real-Time Monitoring pump operating characteristic, once find that frequency conversion operating point is in required workThe lower left of condition point, in flow and lift are all got lower than required operating point, according to the half of setpoint frequency amplitude of variationValue, carries out raising frequency operation, if after operation, water pump operation operating point, again when the upper right side in required operating point, by working asThe half of front change of frequency amplitude, oppositely frequency conversion, so can progressively approach required actual operating mode, final, works as water pumpRunning operating point, in upper right side, with certain precision, while fully approaching the required operating point of pipe network, the variation of stop frequency.
This method carry out the direct motion that both ensures technological process, make again water pump operation put the at utmost fortune of closing to realityRow operating mode, is the method for the efficient operating mechanism of a kind of rapid build water pump, and certainly, carrying out of its operation, must depend on excellentChange operation history data, this depends on pump group pump operating characteristic model library and operation energy mini Mod that the present invention sets up againStorehouse, in this process, the method for operation of final water pump is also as the criterion with the method for operation corresponding to upper right side datum mark.
Claims (4)
1. industrial circulating water pump group operation characteristic and an operational energy efficiency analytical equipment, is characterized in that: this device comprises water pumpCharacteristic model storehouse (A) and water pump and pump group operational energy efficiency model library (B), described pump characteristics model library (A) comprises main frequency water pumpOperation characteristic model library (A1), pump variable frequency operation characteristic model library (A2), the parallel connection of pump group and parallel connection frequency conversion characteristic model storehouse(A3), described water pump and pump group operational energy efficiency model library (B) comprise pump group efficiency unit (B1), water pump unit operation efficiency modelStorehouse (B2) and water pump pump group operational energy efficiency model library (B3) are carried out monitoring and the analysis of operational energy efficiency variation under changeable operating mode;During described main frequency water pump operation characteristic model library (A1) is set up, corresponding approximate power frequency characteristic model is to exist with following form, can directly provide the value of pump operating characteristic parameter by the variation of flow;
Wherein Q, H, η and N are respectively flow, lift, efficiency and the shaft power of water pump,For adopting young waiter in a wineshop or an innWhile taking advantage of method matching, the undetermined coefficient of corresponding approximate multinomial fitting formula.
2. a kind of industrial circulating water pump group operation characteristic according to claim 1 and operational energy efficiency analytical equipment, its featureBe: the foundation of described main frequency water pump operation characteristic model library (A1), comprises lift and flow indication model under power frequency condition, effectRate and shaft power are with the foundation of the explicit model of changes in flow rate; The foundation of described pump variable frequency operation characteristic model library (A2) is rootAccording to frequency conversion correspondence theorem, taking described main frequency water pump operation characteristic model library (A1) as basis, determine under respective frequencies conditionThe value of lift, flow and shaft power, and then construct lift and flow, efficiency and flow and shaft work under different frequency conditionThe each self-corresponding explicit model of rate and flow; The foundation in the parallel connection of described pump group and parallel connection frequency conversion characteristic model storehouse (A3) be by rightSingle pump main frequency water pump operation characteristic model library (A1) of answering and pump variable frequency operation characteristic model, according to the principle of stack, constructSpecify the explicit model of water pump lift and flow under various combination condition; Efficiency and shaft power are carried out the analysis of unit;The foundation of described water pump and pump group operational energy efficiency model library (B): for water pump and the pump group of specifying model, according to corresponding operationEfficiency model, builds operational energy efficiency data table items and table page, for different model water pump and corresponding combination and frequency conversion form thereof,Different table pages can form water pump and pump group operational energy efficiency model library, and the icon instrument in application model storehouse, can form corresponding statesThe graphical interfaces of water pump and pump group operational energy efficiency, this interface form can adopt the mode of coordinate graphic, by the fortune of corresponding operating pointRow efficiency intuitively shows; The establishment of described pump group efficiency unit (B1): whole water pump pump group is used as a complete efficiencyUnit, carries out the establishment of operational energy efficiency; The foundation of described water pump unit operation efficiency model library (B2): motor is at different rotating speedsUnder, from total electric energy of input input, as the gross energy of this efficiency unit, exit of pump sound pressure head and lifting elementaryWater level potential energy sum, as effective output energy of system; For given pipe network system, elementary water level is a definite value substantially,The variation of flow directly causes the variation of initial water level potential energy; The foundation of described water pump pump group operational energy efficiency model library (B3): willWhole water pump pump group is thought of as an efficiency unit, carries out the analysis of operational energy efficiency.
3. a kind of industrial circulating water pump group operation characteristic according to claim 2 and operational energy efficiency analytical equipment, its featureBe: in the foundation of described water pump unit operation efficiency model library (B2), the power factor (PF) under corresponding rotating speed is cos Φ, motorInput power is
In formula,Under respective frequencies, the voltage and current of motor, these two parameters have monitored data intuitively,?For power input to a machine;
The effective output of water pump is
In formula,For the density of cycle fluid;For acceleration of gravity;For the flow of measuring;The required head of pipe network;Pipe network feature hydrostatic head;Exit of pump pipeline sectional area;
The operational energy efficiency that defines water pump in running is
Whole water pump pump group is thought of as to an efficiency unit, adopts house steward's operating pressure and flow as molecule, and will joinSuperpose and calculate the operational energy efficiency of whole pump group as denominator with the shaft power of operation water pump;
。
4. according to a kind of industrial circulating water pump group operation characteristic and operational energy efficiency analytical equipment described in claim 2 or 3, its spyLevy and be: during described pump variable frequency operation characteristic model library (A2) is set up, the analysis of frequency property, according to the similar pass of frequency conversionSystem, taking power frequency operation characteristic as basis and launch according to following relational expression:
Wherein: N represents the shaft power of water pump, kW, subscript e and s be the corresponding parameter representing under operating condition and design conditions respectively;N represents the rotating speed of water pump under different frequency.
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| CN110007232B (en) * | 2019-05-23 | 2021-09-03 | 广东工业大学 | Method and related device for predicting running efficiency of squirrel-cage asynchronous motor |
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